Physical Development Across the Lifespan Practice Test

Frontal lobes fully mature by age 10, so adolescent impulsivity must be caused only by parenting and cannot reflect brain development.

Synaptic growth only increases across adolescence, so impulsivity results from having too few neural connections rather than ongoing reorganization.

Myelination stops after early childhood, so faster adolescent thinking cannot be related to neural changes in white matter.

Prefrontal cortex continues maturing into the mid-20s, while reward-related systems develop earlier, creating an imbalance affecting self-control.